digital modulation, ask, q-ask

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osman yurdakul
osman yurdakul 2011-6-26
hello friends, i have [0 0 0 1 1 0 1 1] bit sequence.
i want to create q-ask modulation scheme like being showed in
http://imageshack.us/photo/my-images/683/qask.jpg/
please help me

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回答（1 个）

Rick Rosson
Rick Rosson 2011-6-26
Please try the following:
  1. Convert the binary sequence to a sequence of symbols with values 0,1,2, or 3.
  2. Map the sequence of symbols to a sequence of amplitude levels -3,-1, +1, +3.
  3. Multiply the sequence of amplitude levels by a sine or cosine wave at the appropriate carrier frequency.
  4. Plot all of the results versus time.
HTH.
Rick

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